Which among Following drugs does not commonly produce fixed drug eruptions:
**Core Concept**
Fixed drug eruptions (FDEs) are a type of skin reaction characterized by the occurrence of one or more well-defined, round or oval patches of skin that recur at the same site upon re-exposure to the offending drug. FDEs can be caused by various medications, including antibiotics, anticonvulsants, and NSAIDs.
**Why the Correct Answer is Right**
Fixed drug eruptions are commonly associated with drugs that are metabolized by the liver, particularly those that are N-acetyl-p-benzoquinone imine (NAPQI) metabolites, such as carbamazepine, phenytoin, and lamotrigine. However, sulfonamides, which are also metabolized by the liver, are less commonly associated with FDEs. This is because sulfonamides are primarily metabolized by the glucuronidation pathway, which is less likely to produce reactive metabolites that can cause skin reactions.
**Why Each Wrong Option is Incorrect**
**Option A:** Some studies have reported sulfonamide-induced fixed drug eruptions, but they are less common compared to other medications.
**Option B:** No evidence suggests that this drug is more likely to cause fixed drug eruptions compared to sulfonamides.
**Option C:** This drug has been associated with a variety of skin reactions, including fixed drug eruptions.
**Option D:** This drug is not commonly associated with fixed drug eruptions.
**Clinical Pearl / High-Yield Fact**
To remember the medications that commonly cause fixed drug eruptions, think of the "NAPQI metabolites" (carbamazepine, phenytoin, and lamotrigine), which are more likely to cause this reaction.
**Correct Answer: D. **